Leading-in bushing for high voltages



J; STOLZ LEADING-IN BUSHING FOR HIGH VOLTAGES Nov. 29, 1927. 1,651,234

Filed March 51, 1927 f ll y d a i l y a I n WITNESSES: d I INVENTOR I Joseph Sfo/z.

Y ATTORNEY I Patented Nov. 29, 1927. UNITED STATES PATENT OFFIQE.

JOSEPH STOLZ, .OF"BERLIN-CHARLOTTENBURG, GERMANY, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

LEADING-IN BUSHING FOR HIGH 'VOLTAGES.

Application filed March 31, 1927, Serial No. 179,896, and in Germany November 6, 1922.

My invention relates to leading-in bushinsulating distance apart in the axial direc- 55 ings for .high voltages. tion, distance pieces 7 are according to my It is well known to construct leading-in invention provided between adjacent edges.- bushings for high voltages of insulating To enable the filling medium to fill up the tubular members or shells made of porce-- hollow spaces completely, partitions or inlain, repelite, stoneware and the like insutermediate layers produced as solid rotation 60 lating material, the internal spaces of which bodies are provided with perforations or reare filled with oil compou ds or the like, cesses on the circumference. To prevent con- It is also known to insert metallic partitions, ct be ween the metallic partitions and the m for instance concentric tubes, into such il inner partition and the connecting bolt 1),

Spaces, which serve the purpose t aff tv th barrier members or tubes 9 of insulating ma- 5 distribution of the field of the bushing. This rial may be placed between them. purpose is, however, in this way attained in h is a flange for securlng the bushing to a very imp rf ct a r ly, the cover or the apparatus and i an elec w My invention relates to a bushing, insulatrlc connection of the outermost concentric tor or duct in which the concentric inser- I t10n e Wlth sald flange h. 310

tions are not cylindrical but are bent towards Various modifications and changes may be the inner wall of the bushing or duct in any made without departing from the spirit and suitable manner. The edges of these curved the scope of the invention, andI desire, thereinsertion members are so spaced from one fore, that only such limitations shall be another, that the distribution of the field placed thereon as are imposed by the prior upon the outer surface of the insulator is art. attained in the desired manner, The field ll claim as my invention 2- may, for instance, be distributed uniformly 1. In a bushing for high voltages in comover the surface of the bushing, so that the bination, an insulating tube, a plurality of equipotential surfaces run uniformly around concentric metallic insertion members with W the bushing. I diverging outer ends located in said tube,

In the drawing affixed hereto, in which distance pieces for the ends of said meman embodiment of myinvention is shown by bers, caps at both ends of said tube, and a no way of example, Figure 1 is a longitudinal connecting bolt extending from end to end sectional view and Fig. 2 is a View taken subof said tube.

stantially along the line IIH of Fig. 1. 2. lln a bushing for high voltages in com- In the drawing which illustrates my im- 'bination, an insulating tube, a plurality of proved bushing or duct, a is the shell of the concentric metallic insertion members with 35 bushing constructed of any suitable. insudiverging outer ends located in said tube,

lating material, I) the conductor orconnectdistance pieces on said insulating tube for .ing bolt, and a and 05 metal end caps closing the ends of said members, caps at both. ends the insulating shell or tube at the top and at of said tube, and a connecting bolt extendthe bottom. In the space between said bolt ing from end to end of said tube. W and the shell are located the partitions e. 3. In a bushing for high voltages in com- These partitions may, for instance, be formed bination, an insulating tube, a plurality of Y as rotation bodies which are directly adaptconcentric metallic insertion members with ed to the desired course of the equipotential diverging outer ends located in said tube, surface. It will be understood, however, insulating barrier members for the central 5 that these partitions may equally well conportions of said members, distance pieces sist of cages constructed of wire or of metal for the ends of said members, caps at both 1 strip and need not necessarilybe continuends of said tube, and a conductor extend .ous rotation bodies. ing 'from end to end of said tube.

In order to avoid' undesired radiations 4. In a bushing for high voltages incom- 56) owing t excessiv density of power lines at bination, an insulating tube, a plurality of the sham edges of the partitions, they may concentric metallic insertion members with preferab y be provided with curled or beaddiverging outer ends located in said tube, ed edges. In order to keep the metallic parinsulating barrier members for the central titions or intermediate layers at the correct portions of said members distance pieces of said tube.

5. In a bushing for high voltages in combination, an insulating tube, a plurality of concentric metallic insertion members with diverging outer ends with curled beaded edges located in said tube, distance pieces upon said insulating tube adapted to keep the ends of said insertion members apart, caps at both ends of said tube, and a conductor extending from end to end of said tube. T v

6. A condenser bushing of substantially uniform cylindrical shape including concentric inner conducting layers vhaving cylindrical portions disposed in predetermined radial relation to divide the voltage gradient alongia radius of the bushing in predetermined steps, said layers being of successively difl'erent lengths and having ends of subface into similar steps.

7. A condenser bushing of substantially uniform cylindrical shape including concentric inner conducting layers having cylindrical portions disposed in predetermined radial relation to divide the voltage gradient along a radius of the bushing in predetermined steps, said layers being of successively dif ferent lengths and having rounded ends of substantially the same diameter along, and adjacent to, the other surface of the bushing to divide the voltage gradient of said surface into similar steps and to prevent concentration of electrostatic stresses at said ends.

In testimony whereof, I have hereunto subscribed my name this 28th day of February, 1927.

' JOSEPH STOLZ. 

